12种杀螨剂对山楂叶螨防效评价及其对天敌塔六点蓟马的影响

The effect of 12 acaricides on Tetranychus viennensis and its natural enemy Scolothrips takahashii in apple orchard

通过施用不同类型的杀螨剂对苹果山楂叶螨Tetranychus viennensis和天敌塔六点蓟马Scolothrips takahashii的影响进行分析,结果表明,15%哒螨灵EC(0.4 mL/L)、73%炔螨特EC(0.5 mL/L)表现出较好的速效性和持效性,但是对塔六点蓟马有一定的杀伤作用,240 g/L螺螨酯SC(0.2 mL/L)、5%唑螨酯SC(0.4 mL/L)对山楂叶螨相对防效较好,对塔六点蓟马影响较小,500 g/L四螨嗪SC(0.2 mL/L)速效性较差,但对天敌安全,20%甲氰菊酯EC(0.5 mL/L)对山楂叶螨防治效果差,且对天敌杀伤率始终较高,从而可能造成山楂叶螨的爆发。复配药剂10%阿维.四螨SC(0.67 mL/L)综合了单剂的优点,15.6%阿维.丁醚EC(0.5 mL/L)、6%阿维.哒EC(0.5 mL/L)相对单剂对天敌杀伤率有所降低,1.8%阿维.甲氰EC(0.83 mL/L)则主要表现出单剂甲氰菊酯相同的特点。

The effect of 12 acaricides on Tetranychus viennensis and its natural enemy Scolothrips taka- hashii in the apple orchard were analyzed. The results showed that Pyridaben 15% EC （0. 4 mL/L） and Propargite 73% EC （0.5 mL/L） had an excellent controlling effect on T. viennensis, but they were not safe to natural enemy S. takahashii; Fenpyroximate 5% SC （0.4 mL/L） and Spirodielofen 240g/L SC （0.2 mE/L） had a good control effect on T. viennensis and had a low killing rate on S. takahashii; Clofen- tenzine 500 g/L SC （0.2 mL/L） against T. viennensis was slower and were safe to S. takahashii; Fen- propathrin 20% EC （0. 5 mL/L） had a bad control effect on T. viennensis and had a high killing rate on S. takahashii. Synergistic acaricides Abamectin · Clofentenzine 10% SC （0. 67 mL/L） synthesize merit of the single-dose, Abamectin ·Pyridaben 6% EC （0. 5 mL/L） and Abamectin · Diafenthiuron 15.6% EC （0. 5 mL/L） reduce the killing rate to S. takahashii; Abamectin · Fenpropathrin 1.8% EC （0. 83 mL/L） was the same to Fenpropathrin.